| 摘要 |
PROBLEM TO BE SOLVED: To selectively support two kinds of optical pickup units by one kind of insulators. SOLUTION: A pair of right and left groove-like portions 188, 189 to support two kinds of elevating/lowering frames 16, 116 with two kinds of the optical pickup units 38, 138 of different thickness are formed on one kind of insulators 119, 120 by in a deviated manner by 90 deg..
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